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Relevant Information:

Dorsal spines (total): 1; Dorsal
soft rays (total): 6; Anal soft rays: 13 - 14. Body elongated,
without scales, almost covered with bony plaque, ventrally flattened
in adults. Terminal mouth has three pairs of barbels. Lower
jaw is shorter than the upper jaw. Eyes small. Feeds on fruits
when the forests are flooded and on the blades of macrophytes
(aquatic plants, growing in or near water that are either emergent,
submergent, or floating). Acts as seed dispersal agent. Reproduction
occurs once a year and juveniles are often seen in large numbers
in the estuary of the Amazon, in the region of Mario.